The world’s lightest rechargeable cell is here.

Two times the energy density of lithium‑ion cells.

A million times the potential.

Welcome to SolidEnergy.

Drones & Space

Consumer Electronics

Electric Vehicles

Drones & Space

Unlimit Flight: Hermes™

Our Hermes™ cell is lighter, safer and more powerful than even the best Li-ion cells. Which means drones can soar to new heights. Flying taxis can take to the skies. The Internet can reach everywhere. It’s not just a vision for the future, but ready to put the future to work today.

Unlimit Smart: Athena™

Imagine freeing up a third of the space in a smartphone to build new features. Or wearables that can run twice as long without a charge. Building on the success of Hermes™, Athena™ will arrive in 2018.

Unlimit EVs: Apollo™

What if you could drive from San Francisco to Los Angeles without burning any fossil fuels and without having to recharge? The Apollo™ cell is coming in 2020, and it will leave everything you know about electric transportation in the rearview mirror.

Next-Generation Technology

In semiconductors Moore’s Law says the number of transistors per area doubles every 18 months, in battery there is a similar phenomenon, where the energy density doubles every 30 years. What we all think of as today’s most advanced battery technology, Li-ion, is actually 30 years old. With lithium metal, we enter a new era in battery technology—lighter and more powerful, not to mention safer than ever. Our unique technology taps into the potential of lithium metal, while eliminating all of the past hazards. Discover how this breakthrough cell technology works.

About Us

Started by a Harvard/MIT student team out of a world-renowned lab at MIT, SolidEnergy is home to a deep bench of proven battery experts. Learn more about our team and our vision of helping you realize your vision.

Better Lithium Batteries to Get a Test Flight

Technology Review

Connect with Us

If you’re interested in becoming an SES customer, investor or team member, we’d really like to hear from you. Have questions? Looking for more information? Whatever you need, we’re here to help you unlimit your potential.